An item of any peripheral shape usually having one flat or spherical surface and a centrally located hole. It is designed for applications involving moving (kinetic) loads. Except for items fabricated from bearing quality synthetic (plastic) or composed of multilayer material, one bearing surface must either have a specific surface finish designation of 32 microinch (0.8 micrometre) or less, arithmetical average (aa) (arithmetic mean deviation) or one of the following conditions: be lapped or ground; have visible or detectable means of lubrication; grooves, indentations; or self-lubrication. The thickness must not exceed 25 percent of the outside diameter of the shortest distance between peripheral flats (when thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance). Excludes straight, tubular (without flange) items having a bearing surface(s) parallel to the axis of the bore only. See also washer, flat and spacer, sleeve.
Dept. of the Navy 
Turkey Classification: Thrust ball bearings
NSN 5965-01-592-1238
NSN 5930-00-189-1480
NSN 6240-00-258-2389
NSN 5835-01-435-4139
NSN 5915-01-196-6016
NSN 7035-01-024-9511
NSN 5945-01-515-7814
NSN 5945-01-277-3213
NSN 5855-01-191-3404
NSN 6135-01-521-0378
NSN 5905-00-501-3734
NSN 6150-01-585-5896